Insulating a Balloon-Framed House
I’m somewhat new to the site.
I recently closed on a 1905 ballon framed house in central NY. According to NY.gov I’m in climate zone 6.
Wall assembly from exterior in
Vinyl siding,1/2 foam, cedar clap board, thick tar paper, 3 1/2 stud, 3/4 board sheathing, 3/8 drywall.
The tar paper is fully intact but is compromised by the fasteners from the vinyl siding.
I’ll be removing the the drywall wall & 3/4 sheathing due to termite damage/mold. I plan to install 1/2 osb in place of the 3/4 sheathing to add strength to the house followed by 1/2 drywall.
I like the detail from one of Martin Holidays articles which is to add an air gap/air barrier/insulation but with existing hot water baseboard/ reducing the size of the stairwell so I can’t fur out the wall unless I remove the baseboard. Would adding spray foam be the best solution?
If yes could I spray it directly to the tar paper as long as there is no water intrusion? Also a spray foam contractor suggested using open cell, I thought closed would be best for this situation.
Alternatively I may add zip sheathing, and new siding down the road(if the price ever drops) so maybe adding 3” rockwool safe n sound flush to the interior of the stud allowing a 1/2” gap will be better than nothing until the time comes to re-side.
Open to any suggestions.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part